Packing for blasting-cartridges.



No. 789,967. PATENTED MAY 16, 1905. T. F. DURHAM.

PACKING FOR BLASTING GARTRIDGES.

APPLICATION FILED DEO.11, 1901.

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ATENT, Fries.

THOMAS F. DURHAM, OF PHILADELPHIA, PENNSYLVANIA.

PACKING FOR BLASTlNG-CARTRIDGES.

SPECIFICATION forming part of Letters Patent No. 789,967, dated May 16,1905.

Application filed December 11, 1901. Serial No. 85,459.

To (ti/Z whom, it may concern:

Be it known that I, THOMAS F. DURHAM, a citizen of the United States,residing at Philadelphia, county of Philadelphia, and State ofPennsylvania, have invented a certain new and useful Improvement inPacking for Blasting- Cartridges, of which the following is aspecification.

My invention relates to a new and useful improvement in packing fordynamite blasting-cartridges, and has for its object to provide apacking which will be inserted in the drill-hole after thedynamite-cartridge has been inserted, and thereby be interposed betweenthe dynamite and the tamping at the open end of the drill-hole, and isfor the purpose of smothering the flame or sparks and absorbing thenoxious gas arising from the explosion of the dynamite.

With these ends in view this invention consists in the details ofconstruction and combination of elements hereinafter set forth and thenspecifically designated by the claim.

In order that those skilled in the art to which thisinvention appertainsmay understand how to make and use the same, the construction andoperation will now be described in'detail, referring to theaccompanyingdrawings, forming a part of this specification, in which-Figure l is a central section through an embankment, showing adrill-hole charged with dynamite with my improved packing locatedtherein; Fig. 2, a perspective view of one form of my improvedpacking-tube; Fig. 3, a longitudinal sectional view of another form ofpacking-tube.

In blasting with dynamite or other explosives in mines or othersubterranean passages great danger is occasioned by the explosion onaccount of the liability of the flame arising from the explosionigniting any surrounding combustible gas, and thereby occasioning fireor a gas explosion in the passage itself. Another danger arising fromthe explosion is that the gas thrown off from the explosion of dynamitewhen it is exploded in the ordinary manner is liable to overcome theminers or workmen by inhaling the same.

the flame and absorb the noxious gas when the explosion occurs.

'In a former application for blasting-cartridge, filed by me June 11,1901, Serial No. 64,081,,1 accomplish the object just described bysurrounding the explosive with a fire-extinguishing agent upon allsides. With this invention I accomplish the same object, but with a moreconvenient and cheaper device, which consists of a tube A, closed ateach end, and when it is desired to blast this tube A. is filled with afire-extinguishing agent, preferably Water, and sealed, and then thisfilled tube is inserted inadrill-hole behind the explosive. The hole isthen 'tamped or plugged up behind the fire-extinguishing packing, andwhen the dynamite is exploded the explosion will burst the tube A,containing the extinguishing agent, and this fire-extinguishing agentwill immediately smother or extinguish any flame arising from theexplosion and will at the same time absorb or prevent the formation ofthe objectionable gases.

The tube A, which is adapted to contain the fire-extinguishing agent,may be formed in any manner so as to be readily filled and sealed. Theform shown in Figs. 1 and 2 consists of a cylinder B, which is fitted ateach end with disks soldered into the cylinder, and a hole D is punchedthrough each of these disks. In filling the packing-tube one end of thesame is immersed in the fire-extinguishing fluid, and said fluid willrush in the lower end through one of the punched holes D and the airwill escape through the other hole D in the upper end, or the tube maybe filled by holding it in a running stream of Water, so that the waterwill run in one end and the air escape at the other, and then the twosmall holes D are plugged or sealed with any suitable substance, such aswax, soap, &c.

In Fig. 3.1 have illustrated another form, in which the packing-tubecould be constructed and in which the tube is drawn so as to leave oneend closed and solid therewith and the open end is adapted to be closedby a cap E. This cap is removed when it is desired to fill the tube, andafter the same is filled it is placed upon the tube and may be sealedaround prising a cylinder with heads set slightly back within the same,each head havingahole, the whole being coated with paraffin, a seal forthe openings in the head of the cylinder, and a. fireextinguishing agentWithin the receptacle.

In testimony whereof I have hereunto affixed my signature in thepresence of two subscribing witnesses.

THOMAS F. DURHAM.

itnesses:

H. B. HALLooK, L. WV. MoRRIsoN.

